Shown with a cast-on count of 18 stitches.  

• Row 1 (RS): K3, *yo wrapping yarn twice, k2tog, k3, repeat from *.
• Row 2: K5, *yo wrapping yarn twice, k2tog, k3, repeat from * to last 3 sts, yo wrapping yarn twice, k2tog, k1.
• Row 3: K3, *k2, yo wrapping yarn twice, k2tog, k1, repeat from *.
• Row 4: K3, *yo wrapping yarn twice, k2tog, k3, repeat from *.
• Repeat rows 2-4.